PMID: 9443891Apr 4, 1998Paper

Changes in protein composition of meiotic nodules during mammalian meiosis

Journal of Cell Science
A PlugT Ashley

Abstract

Homologous chromosome synapsis and meiotic recombination are facilitated by several meiosis-specific structures: the synaptonemal complex (SC), and two types of meiotic nodules: (1) early meiotic nodules (MNs), also called zygotene nodules or early recombination nodules, and (2) late recombination nodules (RNs). The former are thought to be nucleoprotein complexes involved in the check for homology preceding, or accompanying synapsis, while the latter have been shown to be involved in reciprocal recombination. We have examined by immunocytochemistry the meiotic localization of a series of proteins at sites along the asynapsed axial elements prior to homologous synapsis and at sites along the SCs following synapsis. Several of the proteins examined have been implicated in repair/recombination and include RAD51, a mammalian homolog of the Escherichia coli RecA protein; Replication Protein-A (RPA), a single-strand DNA binding protein; and MLH1, a mismatch repair protein which is a homolog of the E. coli MutL protein. In addition two proteins were examined that have been implicated in meiotic checkpoints: ATM, the protein mutated in the human disease Ataxia Telangiectasia, and ATR, another member of the same family of PIK kinases. ...Continue Reading

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